Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 74: Neutrino Physics without Accelerators 5

T 74.6: Vortrag

Mittwoch, 23. März 2022, 17:35–17:50, T-H33

The CRAB Experiment: a New Calibration Technique for CEvNS Detectors in the 100 eV Regime — •Victoria Wagner for the CRAB collaboration — Physik-Department, Technische Universität München, D-85748 Garching, Deutschland

Searches for light dark matter (DM) and studies of coherent elastic neutrino-nucleus scattering (CEvNS) imply the detection of nuclear recoils in the 100 eV range. However, an absolute energy calibration in this regime is yet missing. The CRAB project proposes a method based on nuclear recoils induced by the emission of an MeV-gamma following thermal neutron capture. Detailed feasibility studies show that this method yields distinct nuclear recoil calibration peaks at 112 eV and 160 eV for tungsten. In the first phase, the CRAB project foresees to perform a nuclear recoil calibration of cryogenic CaWO₄ detectors read-out by TES. The low power TRIGA reactor in Vienna provides a clean beam of thermal neutrons well suited for such a measurement. In the second phase, additional tagging of the photons produced in the de-excitation process will allow to extend the calibration method to even lower energies and to a wider range of detector materials, such as Ge. Combined with an electron recoil calibration, CRAB will allow to measure energy quenching in the sub-keV regime. With its novel idea, CRAB provides a direct and accurate calibration of nuclear recoils in the ROI of light DM and future CEvNS experiments, which is essential for studying new physics.
This work is supported by the DFG through the Excellence Cluster ORIGINS and the SFB1258.